Music
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Metronome
Practice metronome and click-track builder with WAV, MP3 and MIDI export.
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Beat Grid
Drum step sequencer with a synthesized kit, song chains, share links and WAV export.
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Fretboard
Scales, arpeggios and a chord namer for guitar, bass, ukulele, mandolin and banjo.
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Studio Calculator
Delay times from BPM, pitch shifts, note frequencies, file sizes and room modes.
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Tuner
Needle and strobe tuner with adjustable A4, string presets and reference tones.
- Chord Progressions Build a progression in any key and hear it played.Coming soon
- Chord Transposer Move a chord sheet to any key.Coming soon
- Circle of Fifths Keys, signatures and the chords in each key, on one wheel.Coming soon
- Drone Sustained reference tones for playing and singing in tune.Coming soon
- Ear Trainer Hear intervals, chords and scales, and learn to name them.Coming soon
- Piano Any chord or scale on a playable keyboard.Coming soon
- Setlist Maker Put the show in order and print it big for the stage floor.Coming soon
Games and puzzles
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Dice Roller
Roll any dice notation, see every die, and chart the exact odds of the result.
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Falling Sand
Pour sand, water, oil and lava into a pixel world, then set the wood on fire.
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No-Guess Minesweeper
Minesweeper where every map can be solved by logic, with hints that show the proof.
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Nonograms
Picture logic puzzles: a hand-drawn book, a daily puzzle and an endless generator.
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Sudoku Coach
Graded sudoku whose hints explain the next logical step and mark it on the grid.
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Wildfire
Light a fire on a living landscape and watch wind, slope, fuel and weather shape it.
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Word Ladder
Turn one word into another a letter at a time, with a daily ladder and par.
- An Interactive Story An original story where your choices decide how it ends.Coming soon
- Calcudoku Arithmetic cage puzzles with one solution each.Coming soon
- Checkmate Trainer Practice the basic checkmates against a defender that never slips.Coming soon
- Four in a Row Play a friend or a computer that plays perfectly at its best.Coming soon
- FreeCell Numbered FreeCell deals with hints and unlimited undo.Coming soon
- Gravity Golf Mini golf in space: bend your shot around the planets.Coming soon
- Jigsaw Turn your own photo or a classic painting into a jigsaw.Coming soon
- Lights Out Switch every light off, and see why the solution works.Coming soon
- Logic Grid Puzzles Einstein-style logic puzzles with a unique answer every time.Coming soon
- Mazes Mazes to solve on screen or print, with answer keys.Coming soon
- Memory The card-matching game, from little kids to grown-ups.Coming soon
- Pentominoes Fit all twelve pentominoes into the board.Coming soon
- Slide Puzzle The 8, 15 and 24 puzzles, with numbers or your own picture.Coming soon
- Solitaire Klondike with draw one or three, hints and winnable deals.Coming soon
Everyday tools
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Ambient Noise
Mix rain, surf, wind, fire and noise colors, with a sleep timer and focus intervals.
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Date Calculator
Days between dates, date math, business days with your own days off, ISO weeks.
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Meeting Time
See working hours line up across cities, pick a slot, and share it in every time zone.
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Passphrase Generator
Diceware passphrases from the EFF word lists, the dice behind each word, and passwords.
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Photo Calculator
Depth of field on a working lens scale, plus exposure, ND, star trails, time-lapse, print.
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QR Code Maker
QR codes for links, Wi-Fi, contacts and events, with colors, a logo and PNG or SVG.
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Sun and Moon
Sunrise, sunset, twilight, golden hour and the moon for any place and date.
- Compound Interest See savings grow with contributions and compounding.Coming soon
- Countdown Count down to any moment, full screen, with a link to share.Coming soon
- Debt Payoff Planner Compare snowball and avalanche plans for paying off debt.Coming soon
- Device Check Test your keyboard, mouse, mic, camera, speakers and screen.Coming soon
- Flashcards Make flashcard decks and study them with spaced repetition.Coming soon
- Grade Calculator Your weighted grade, and what you need on the final.Coming soon
- Loan Calculator Payments and a full amortization schedule for any loan.Coming soon
- Markdown Editor Write Markdown with a live preview.Coming soon
- Pick One Name wheels, group makers, dice and coins for classrooms.Coming soon
- Split the Check Split a bill item by item, with tax and tip shared fairly.Coming soon
- Stage Timer A big countdown for speakers, run from a second window.Coming soon
- Time Card Add up a week of hours, breaks and overtime.Coming soon
- Unit Converter Convert units of every kind, using exact definitions.Coming soon
Home and hobby
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Kitchen Math
Scale any recipe with clean kitchen fractions, plus pan sizes and conversions.
- Baker's Percentages Bread formulas in baker's percentages, scaled to any batch.Coming soon
- Coffee Ratio Coffee-to-water ratios for every method, with a brew timer.Coming soon
- Cut List Optimizer Lay out cuts to use the fewest boards and sheets.Coming soon
- Electronics Calculators Resistor codes, Ohm's law, LED resistors and more.Coming soon
- Knitting and Crochet Calculators Gauge, sizing and even increases for knitters and crocheters.Coming soon
- Project Calculators Paint, flooring, mulch, concrete and more for home projects.Coming soon
- Seed Starting Calendar Sowing and transplant dates from your last frost date.Coming soon
Files and design
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PDF Tools
Merge, split, reorder, rotate and number PDF pages, or turn images into a PDF.
- Image Kit Resize, compress and convert images without uploading them.Coming soon
- Palette Color palettes with contrast checks and color-blind previews.Coming soon
- Text Tools Count, clean, sort, compare and convert text.Coming soon
Code and data
- Cron Expressions Build a cron schedule or read one in plain English.Coming soon
- JSON Tools Format, validate and convert JSON, YAML and CSV.Coming soon
- Number Converter Number bases, Roman numerals, words and more.Coming soon
- Regex Tester Test regular expressions with live matches and explanations.Coming soon
Printables
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Printable Paper
Graph, dot, lined, music staff, tab, Cornell and calligraphy paper as vector PDFs.
- Bingo Cards Printable bingo cards from your own words, plus a caller.Coming soon
- Certificate Maker Award certificates for classrooms and teams.Coming soon
- Chore and Reward Charts Weekly chore charts for kids, with sticker boxes.Coming soon
- Handwriting Worksheets Tracing worksheets from any words you choose.Coming soon
- Printable Calendars Year, month and week calendars to print.Coming soon
- Puzzle Maker Word searches and criss-cross puzzles from your own words.Coming soon
Learning
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Chance
Monty Hall, the birthday problem, a Galton board, coins, dice and random walks to run.
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Epicycles
Draw a shape and watch rotating circles redraw it, one Fourier term at a time.
- Cellular Automata Conway's Life, its cousins, and patterns that seem alive.Coming soon
- Ciphers Encode, decode and crack classic ciphers.Coming soon
- Graphing Calculator Plot functions and curves, and find roots and crossings.Coming soon
- Logic Gates Build circuits from gates, from NAND up to memory.Coming soon
- Morse Code Translate, hear, tap and learn Morse code.Coming soon
- Orbits A gravity sandbox where Kepler's laws play out live.Coming soon
- Periodic Table Every element, with properties and trends in color.Coming soon
- Solar System Scale Model Shrink the Sun to any size and see where the planets land.Coming soon
- Sorting Algorithms Watch and hear sorting algorithms race each other.Coming soon
- Sound Waves See and hear frequency, harmonics and interference.Coming soon
- Telling Time Learn to read a clock with hands you can move.Coming soon
- Times Tables Multiplication practice that focuses on the facts a child misses.Coming soon
Just for fun
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Band Name Generator
Band names by genre, with album and song titles and a cover in the genre's lettering.
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Corporate Speak
Buzzword generator, jargon translator with an honest decoder, and meeting bingo.
- Charades Word lists, a timer and scores for a game of charades.Coming soon
- Charts of Everyday Life Original charts about the small truths of ordinary life.Coming soon
- Icebreakers Conversation starters and quick games for any group.Coming soon
- Name Forge Names for characters, towns, taverns and ships.Coming soon
- Pixel Art Draw pixel art and animate it.Coming soon
- Polite No Pick the situation and the tone, get a way to say no.Coming soon
- Story Dice Roll picture dice and tell the story they suggest.Coming soon
- Word Fill Stories Fill in the words, then read the silly story you made.Coming soon
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